layoutSubviews is a method that is called automatically during view size changes. It can be used by a custom view to perform additional manual changes above and beyond any autoresizing behaviors
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Lazy Instantiation (initialisation ) , this technique is good if you have an object that only needs to be configured once and has some co...
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provides a mechanism for broadcasting information within a program, using notification we can send message to other object by adding obser...
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Abstract Factory Pattern Its a creational design pattern. It's extension to factory method. It creates more level of abstraction t... -
A selector is the name used to select a method to execute for an object, or the unique identifier that replaces the name when the source...
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Executes a block object once and only once for the lifetime of an application. This function is useful for initialization of global data...
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Core Video provides a pipeline model for digital video in iOS. Partitioning the processing into discrete steps makes it simpler fo...
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There is no difference between both notification for the user both seems the same to him. Only change is user will be notified at ...
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View Controllers are the link between data and view(visual appearance). Whenever iOS displays anything on screen it is managed by the View...
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Delegates are created using protocols. protocol is used the declare a set of methods that a class that "adopts" (declares that...
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NSAutoreleasePool:- The NSAutoreleasePool class is used to support Cocoa’s reference-counted memory management system. An autor...
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